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Finding the Fourth Proportional to 13,460.40, 20,190.60 and 12,855.60

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Solution

The fourth proportional to 13,460.40, 20,190.60 and 12,855.60 is: 19,283.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,460.40 : 20,190.60 = 12,855.60 : x
  2. Step 2: Convert to fraction form
    13,460.40/20,190.60 = 12,855.60/x
  3. Step 3: Cross multiply
    13,460.40x = 20,190.60 × 12,855.60
  4. Step 4: Simplify right side
    13,460.40x = 259,562,277.36
  5. Step 5: Solve for x
    x = 259,562,277.36/13,460.40
  6. Step 6: Final answer
    x = 19,283.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.